beliefer commented on issue #27058: [SPARK-30395][SQL] When one or more DISTINCT aggregate expressions operate on the same field, the DISTINCT aggregate expression allows the use of the FILTER clause URL: https://github.com/apache/spark/pull/27058#issuecomment-572915374 > btw, we need a different approach for supporting multiple distinct groups (SPARK-30396)? Why did you split the distinct support into two? This PR will support `select a, sum(distinct b) filter (where ...) from t group by a;` We only have one DISTINCT aggregate expr, so the columns where the aggregate function acting on is same. `select a, sum(distinct b) filter (where ...), count(distinct b) filter (where ...) from t group by a;` We have two DISTINCT aggregate exprs, but the columns where each aggregate function acting on is same. SPARK-30396 will support `select a, sum(distinct b) filter (where ...), count(distinct c) filter (where ...) from t group by a;` We have two DISTINCT aggregate exprs, the columns where each aggregate function acting on is different.
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